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如何处理上千万的items？

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#1

Hi,
大家好，我在用QGraphicsView 和QGraphicsScene 来处理大量items的时候，特别慢。
请教一下有什么办法可以加速GUI的速度？或者如何选择性的渲染？
比如在full view的时候只显示个模糊的图，当zoom in的时候，可以慢慢显示细节。
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